Effect of a PPAR-Alpha Agonist on the Age Related Changes in Myocardial Metabolism and Mechanical Function
Recruitment status was Active, not recruiting
The purpose of this study is to determine if treatment with a drug called fenofibrate, which is a PPAR-alpha agonist and controls how the heart metabolizes fats, will reverse the age-related decline in cardiac fat metabolism and mechanical function.
|Study Design:||Allocation: Non-Randomized
Endpoint Classification: Pharmacokinetics/Dynamics Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Basic Science
|Official Title:||PET (Positron Emission Tomography) Detection of the Effects of Aging on the Human Heart (Aim #2 Effect of a PPAR-Alpha Agonist on the Age Related Changes in Myocardial Metabolism and Mechanical Function)|
- Shift in Myocardial substrate utilization in aging hearts [ Time Frame: After the day-30 PET scan ] [ Designated as safety issue: No ]
- Increased left ventricular function due to shift in substrate use in aging hearts [ Time Frame: After the day-30 PET scan ] [ Designated as safety issue: No ]
|Study Start Date:||October 2005|
|Estimated Study Completion Date:||December 2009|
|Estimated Primary Completion Date:||December 2009 (Final data collection date for primary outcome measure)|
148mg daily for 30 days
Other Name: Lofibra; TriCor
In older Americans, cardiovascular disease is the leading cause of death and disability. It has been shown recently that with aging the human heart exhibits a decline in myocardial fatty acid utilization (MFAU) and oxidation (MFAO) and that these metabolic changes are paralleled by a decline in mechanical function. It has also been shown that peroxisome proliferator activated receptor alpha (PPAR-alpha) activates the expression of the genes encoding enzymes involved in mitochondrial fatty acid transport and oxidation. There is both indirect and direct evidence that PPAR-alpha-mediated responses decrease with age. Consequently, we hypothesize that changes in fatty acid in the aging heart may be mediated, at least in part, via a decline in PPAR-alpha-mediated responses. Thus, administration of a PPAR-alpha agonist to older humans will result in a shift in cardiac fatty acid metabolism to that more closely seen in younger humans and this shift will be paralleled by an improvement in cardiac mechanical function.
To prove or disprove this hypothesis, we will determine, in aged and young healthy volunteers, whether stimulation of PPAR-alpha using the partial agonist, fenofibrate, shifts myocardial substrate utilization by increasing MFAU and MFAO, and whether these changes are associated with an increase in left ventricular function. Study participants will have 4 clinic visits, each lasting approximately 5 hours.
|United States, Missouri|
|Washington University School of Medicine|
|St Louis, Missouri, United States, 63110|
|Principal Investigator:||Robert Gropler, MD||Washington University School of Medicine|